add gitignore
set ag as vim's grepprg
tmux.conf
pythonrc
clean up vim bundles
remove untrue comment from README
remove vim/.netrwhist
cleanup .gitmodules
remove slime.vim

Alternatives:
* https://github.com/jpalardy/vim-slime
* vim-conque
update pathogen from 1.3 to 2.2
cleanup and organize vimrc
add tclshrc
improve install script

Keeping a list of modules in the install script itself was a stupid
idea. Install whatever is in dotfiles/.